JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 16
·1-14
·
IF 2.8
Cao Renping,Cao Ya,Rong Yongtong,Lan Bang,Nie Jingheng,Zhang Lei,Chen Yuyu,Wang Jing
Eu 3+ and Dy 3+ as activators in luminescence materials have been widely investigated because of their superior luminous properties. In this work, we synthesize Sr 2 MgSi 2 O 7 :Dy 3+ , Sr 2 MgSi 2 O 7 :Eu 3+ , and Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ in air via the solid-state reaction method. We research crystal phase and purity of all samples via XRD, discern their crystal structure and space-group, and investigate their luminescence properties. The yellow emission of Sr 2 MgSi 2 O 7 :Dy 3+ with emission spectrum in the range of 450–775 nm can be observed due to the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ ion. The red emission of Sr 2 MgSi 2 O 7 :Eu 3+ in the range of 550–725 nm is shown owing to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ under excitation 388 nm shows yellow emission with chromaticity coordinates (0.3578, 0.3911) and glows red–orange light with chromaticity coordinates (0.5753, 0.3863) under excitation 394 nm. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ can shows tunable emission when the ratio between Eu 3+ and Dy 3+ ions is changed. The energy transfer from Dy 3+ to Eu 3+ ions are known via the spectral features. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ has a good thermal stability. Luminous mechanisms and energy transfer process of samples are analyzed by the energy level diagrams of Dy 3+ and Eu 3+ ions.
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SUPERLATTICES AND MICROSTRUCTURES
·
2015
·
IF 2.097
Renping Cao,Haidong Xu,Dedong Peng,Shenhua Jiang,Zhiyang Luo,Wensheng Li,Xiaoguang Yu
Novel CaWO 4 :Eu 3+ , Mn 2+ red phosphor is synthesized by solid-state reaction method in air. CaWO 4 :Eu 3+ , Mn 2+ phosphor with excitation 268 and 394 nm emits red light with chromaticity coordinates (x = 0.6403, y = 0.3593). The strongest emission bands peaking at ∼615 nm is attributed to 5 D 0 → 7 F 2 of Eu 3+ ion. Strong excitation band peaking at ∼394 nm indicates that the phosphor may be excited by near UV (∼394 nm) chip. Emission intensity of CaWO 4 :Eu 3+ , Mn 2+ phosphor with excitation 268 nm is ∼2 times stronger than that of CaWO 4 :Eu 3+ phosphor owing to energy transfer between Eu 3+ ion and Mn 2+ ion. Energy transfer from WO 4 2 − group and Eu 3+ ion to Mn 2+ ion in CaWO 4 :Eu 3+ , Mn 2+ phosphor may be explained via luminescence properties. Luminous mechanism is analyzed by energy level diagrams of WO 4 2 − group, Mn 2+ and Eu 3+ ion. The paper content is helpful to develop and research other novel phosphors.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoyi Wu,Yeqing Chen,Rui Li,Qingguang Zeng,Ting Yu
Förster resonant energy transfer (FRET) is a well-known and important phenomenon in physics , chemistry, and biology, which plays a crucial role in various photofunctional systems, including photovoltaics , and lighting, and sensing where molecular distances and interactions are probed. This paper presents a systematical investigation of the construction of interfacial FRET between carbon dots (CDs) and NaYF 4 :Eu 3+ nanoparticles (NPs) via various synthesis routes. The interfacial FRET was found to take place from CDs to Eu 3+ in the wet-mixed and the reacted nanocomposites owing to the presence of strong interfacial interactions, as evidenced by the results of Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). By employing CDs-sensitized NaYF 4 :Eu 3+ NPs as a model system, we were able to elucidate the intricate FRET mechanism between CDs and NaYF 4 :Eu 3+ NPs. Surprisingly, the reacted nanocomposite exhibits remarkable photo- and thermal-stability, as well as high resistance to thermal degradation , demonstrating the robustness of the interfacial FRET in enhancing Eu 3+ emission intensity. The study presents a convenient and versatile approach to achieving interfacial FRET based on CDs nanocomposites, which have a promising potential application in solid-state lighting and biomedicine.
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APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Xiang-Yang Chen,Zhi-Jun Zhang,Lin-Lin Zhu,Meng Xu,Hong Wang,Ai-Guo Li,Jing-Tai Zhao
Novel Lu 2 WO 6 :Eu 3+ films with excellent luminescence performance were successfully prepared by Pechini method for the first time and characterized with X-ray diffraction (XRD), micro X-ray fluorescence imaging (μ-XRF), atomic force microscope (AFM), and X-ray excited luminescence (XEL), etc. Eu 3+ -doped films emitted strong red light peak wavelength at 612 nm under both UV light or X-ray excitation. The optimal annealing temperature and Eu 3+ -doped concentration are around 950 °C and 10 mol%, respectively. In addition, luminescence mechanism associated with Eu 3+ site occupation and possible energy transfer of Lu 2 WO 6 :Eu 3+ films have also been proposed. The optimized thin film shows great potential for applications as a candidate for X-ray imaging due to its high density, suitable emission wavelength and high light yield.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2013
·
IF 2.416
Bing Yan,Min Guo
Novel organic/inorganic/polymeric hybrid microspheres are constructed with rare earth complexes into polymer matrix through covalent bonds. Functional covalent polymer linkages (abbreviated as PAAR(MR)-M1(M2, M3)) are achieved from the functionalization of three 4-substituted aromatic carboxylic acid derivatives (4-aminobenzoic acid (M1), 4-mercapto benzoic acid (M2), 4-hydroxybenzoic acid (M3)) with two polymer resins ( para -alkoxy-benzyl alcohol resin (PAAR) or Merrifield resin (MR)), which are through nucleophilic substitution reaction between amino (mercapto and hydroxyl) groups of M1 (M2,M3) and methyl chloride groups of PAAR (MR). Furthermore, ternary rare earth polymeric hybrid microsphere (abbreviated as PAAR(MR)-M1-3-RE-Phen) are constructed through coordination bonds with covalent polymer linkages and 1,10-phenanthroline (Phen) as ligands. The physical characterization and particularly the photoluminescence property of them are studied in detail, which present the regular microsphere morphology and characteristic photoluminescence.
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MATERIALS LETTERS
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2013
·
IF 2.224
Jintai Lin,Shuting Pang,Qianming Wang
We used ultrasonic-assisted microwave technique to synthesize V 2 O 5 /MgF 2 :Eu 3+ with characteristic red emissions. Phototocatalytic performances and emission properties were improved compared to the traditional route. Further investigation indicates that 9% V 2 O 5 (molar ratio V/Mg=9%) gave the best result for decomposing methylene blue (91% in 1 h).
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JOURNAL OF RARE EARTHS
·
2015
·
IF 1.261
Mengting LI,Baoxiang JIAO
ZnTiO 3 :Eu 3+ phosphors were synthesized with different concentrations of Eu 3+ doping through sol-gel method. The samples were calcined at different temperatures for 2 h in air. The synthesized powders were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), transmission electron microscopy (TEM), Raman and photoluminescence spectroscopy. The XRD results showed that the ZnTiO 3 :Eu 3+ phosphors doped with different concentrations of Eu 3+ ions calcined at 600 °C were of single phase, which indicated that the Eu 3+ ions had been successfully incorporated into the ZnTiO 3 host lattice and did not destroy the lattice structure of ZnTiO 3 host. The Raman spectrum, SEM and TEM also proved that the doping of Eu 3+ did not change the lattice structure of hexagonal ZnTiO 3 host. The photoluminescence (PL) of Eu 3+ ions with the main emission peak at 614 nm was observed to increase with Eu 3+ concentrations from 0.5 mol.% to 2.0 mol.% and decreased when the concentration was increased to 2.5 mol.%. The decrease in the PL intensity at higher Eu 3+ concentrations could be associated with concentration quenching effect. The CIE1931 chromaticity diagram ( x , y ) of ZnTiO 3 :2.0 wt.%Eu 3+ phosphors were located in the red region ( x =0.652, y =0.347). The luminescence properties suggested that ZnTiO 3 :Eu 3+ phosphors might be regarded as a potential red phosphor candidate for light emitting diodes (LEDs).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 4
·3514-3519
·
IF 1.569
Cao Renping,Fu Ting,Cao Yunling,Jiang Shenhua,Gou Qingdong,Chen Zhiquan,Liu Pan
Novel CaSb 2 O 6 :Eu 3+ , Bi 3+ phosphor is synthesized by solid-state reaction method in air. Their crystal structures are investigated. Luminescence properties of CaSb 2 O 6 :Eu 3+ , CaSb 2 O 6 :Bi 3+ , and CaSb 2 O 6 :Eu 3+ , Bi 3+ phosphors are compared, analyzed and explained, respectively. Tunable emission of CaSb 2 O 6 :Eu 3+ , Bi 3+ phosphor with excitation 298 nm can be observed by changing Eu 3+ or Bi 3+ concentration. Energy transfer (ET) and charge compensation in CaSb 2 O 6 :Eu 3+ , Bi 3+ phosphor are observed and analyzed via its luminescence properties. Lifetimes of CaSb 2 O 6 :5 %Eu 3+ , yBi 3+ phosphor (0.5 ≤ y ≤ 5 mol%) are investigated, which further confirm that ET process can be formed between Eu 3+ ion and Bi 3+ ion. The luminous mechanism is explained via the energy level diagrams of Bi 3+ and Eu 3+ ions. The emission properties indicate that CaSb 2 O 6 :Eu 3+ , Bi 3+ phosphor has a potential application for white LEDs based on near UV (~394 nm) LED chip.
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OPTICAL MATERIALS
·
2014
·
IF 2.075
Lina Liu,Surong Yue,Yongsheng Zhang,Ruifei Qin,Lishuang Liu,Dongmei Zhang,Ruirui Sun,Linfeng Chen
Core–shell structured YVO 4 :Eu 3+ @SiO 2 nanocomposite particles were synthesized using a one-pot reverse microemulsion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV absorption spectra , and photoluminescent spectra. The nanocomposite particles are well-dispersed and about 20 nm in average size. The synthesis method is of one-pot, simplifying the preparation of this kind of core–shell structured nanocomposites. The formation process of these nanocomposite particles is suggested and the photoluminescence properties of them are studied and compared with those of uncoated YVO 4 :Eu 3+ sample.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Renping Cao,Jinrong Wang,Binhui Zhong,Ting Chen,Bang Lan,Fangrui Cheng,Ru Liu,Jing Wang
New tunable-color luminescent materials with single pure phase are one of the main research objectives at present. We synthesize La 7 Nb 3 W 4 O 30 :R (LNWO:R) (R Dy 3+ , Eu 3+ , and Dy 3+ /Eu 3+ ) in air. The high temperature solid-state method is used. We study the purity, crystal phase and structure, luminescence properties, and lifetimes of the samples. Excitation spectrum of LNWO:Dy 3+ comes from the O 2− - Dy 3+ charge transfer band (CTB) and the f – f electron transitions of Dy 3+ . LNWO:Dy 3+ can glow yellow light due to the transitions 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 of Dy 3+ . LNWO:Eu 3+ has excitation spectrum due to the O 2− - Eu 3+ CTB and the f – f electron transitions of Eu 3+ . LNWO:Eu 3+ emits the red-orange/red light owing to the transitions 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 of Eu 3+ . The emitting color of LNWO:Dy 3+ , Eu 3+ can be adjusted by changing the excitation wavelength and the content of Dy 3+ and Eu 3+ because of the double effects of energy transfer among Eu 3+ ions and energy of Dy 3+ . The yellow, red-orange, and red emission of LNWO:Dy 3+ , Eu 3+ is found. The lifetime rises with adding doped-ions concentration owing to the increase of non-radiative transitions. The luminous mechanism is analyzed via energy level diagrams. The research results offer a help for the development of new luminescent materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiantao Lü,Ting Fan,Jie Liang,Yayun Zhou,Tingting Deng,Ruming Jiang
With the combination of carbon quantum dots (CDs) and rare earth-doped fluorescent materials, multi-mode luminescence can be achieved in fluorescent ink, thereby enhancing its anti-counterfeiting security coefficient. However, the self-quenching process in CDs currently hinders their application in the field of anti-counterfeiting. In this study, we employed simple chemical method to prepare the SiO 2 -encapsulated YVO 4 :Eu 3+ /CDs nanocomposites, which greatly improved the stability of the composite and achieved dual-mode solid-state luminescence. Quick response code anti-counterfeiting patterns were fabricated using screen printing technology, and dual-mode luminescence performance with red and blue emission was achieved under excitation at 254 nm and 365 nm respectively. The YVO 4 :Eu 3+ @SiO 2 @CDs nanocomposites showed stable dual-mode luminescent performance in both solid-state and solvent environment, demonstrating great potential in anticounterfeiting and information protection application.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Shao-Rong Bie,Ding-Shun She,Wen Yue
A series of new apatite-type red-emitting Ca 10 (PO 4 ) 6 F 2 :Eu 3+ phosphors have been synthesized via the hydrothermal method. The Rietveld refinement results indicate that when the Eu doping concentration is less than 14 mol.%, the phosphor maintains a pure fluorapatite phase with no detectable impurities, and the Eu 3+ ions preferentially occupy the Ca2 sites within the host lattice. The PL emission spectrum under the excitation of 352 nm consists of the highest emission band (618 nm) and four relatively weak emission bands (579 nm, 591 nm, 653 nm and 696 nm) which correspond to the 5 D 0 → 7 F J transitions (J = 0, 1, 2, 3 and 4). The emission intensity decreases at concentrations above 10 mol.%, due to dipole-dipole interactions and concentration quenching. The Commission Internationale de l’Éclairage (CIE) chromaticity coordinate of the Ca 10 (PO 4 ) 6 F 2 :Eu 3+ (x = 10 mol.%) phosphor is near (0.6341,0.3652). The color purity is approximately 86.95 % and the internal quantum yield is 62.8 %. The activation energy for thermal quenching for this phosphor is 0.29 eV, and more than 50 % of its emission intensity is retained at 498 K, demonstrating excellent thermal stability. Owing to their outstanding thermal quenching luminescence properties, the Ca 10 (PO 4 ) 6 F 2 :Eu 3+ phosphors are well-suited for application in white-LEDs, acting as the red-emitting component in warm white light generation.
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